TED-ED: The otherworldly creatures in the ocean's deepest depths - Lidia Lins

The deep ocean, a cold and dark region, is home to diverse life forms. Despite challenges like high pressure and lack of light, many species thrive due to adaptations such as bioluminescence and marine snow as a food source. Theories like Edward Forbes' Azoic Theory were disproven by the discovery of deep-sea life. Unique adaptations include dwarfism and gigantism, allowing survival in nutrient-scarce environments. The deep sea remains largely unexplored, holding many mysteries and potential discoveries.

What percentage of the ocean is considered a cold and dark region known as the deep ocean?

• 80%

• 90%

• 60%

• 30%

What is marine snow primarily composed of?

• Minerals and rocks

• Organic matter like dead algae and animals

• Salt and sand

• Water and air bubbles

How do some deep-sea creatures use bioluminescence?

• To navigate the ocean floor

• To communicate with humans

• To lure prey and attract mates

• To generate heat

What adaptation allows jellyfish and similar creatures to migrate between depths?

• Their strong muscles

• Their large size

• Their ability to change color

• Their 90% water consistency

What is a possible reason for gigantism in some deep-sea creatures?

• High oxygen levels and cold temperatures

• Abundant sunlight

• Lack of predators

• High salt concentration

Why might some deep-sea creatures exhibit dwarfism?

• Due to reduced food availability

• To conserve oxygen

• To blend in with the environment

• To avoid predators

What percentage of the ocean remains unexplored by humans?

• 100%

• 50%

• 70%

• 95%